I think I know what Google is trying to do (and I like it!). Google knows that their Wave will become the next Facebook (in popularity) and it is a win-win situation for them. Users will either install Chrome where Google will get greater market share OR install Chrome Frame where Google will get market share anyway!

So Google gets greater market share either way! This is just too funny

Now, imagine all of the IE users in the world utilizing Chrome Frame from their IE browsers (because they want to use Wave). Google's market share will sky rocket!

Even if it's not Chrome they choose, say it's Firefox, then Firefox gets the market share so this move is also good for Firefox! I have a bad feeling, something tells me MS will make an update to block this.

Even funnier though, when they ask the user to install a browser, Opera isn't listed - well based on the screenshot